20949696 has 84 divisors (see below), whose sum is σ = 61734192. Its totient is φ = 6787584.

The previous prime is 20949689. The next prime is 20949697. The reversal of 20949696 is 69694902.

It is not an unprimeable number, because it can be changed into a prime (20949697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20821 + ... + 21803.

Almost surely, 2^20949696 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20949696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30867096).

20949696 is an abundant number, since it is smaller than the sum of its proper divisors (40784496).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20949696 is a wasteful number, since it uses less digits than its factorization.

20949696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1038 (or 1025 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 45.

The square root of 20949696 is about 4577.0837877408. The cubic root of 20949696 is about 275.6719479779.

The spelling of 20949696 in words is "twenty million, nine hundred forty-nine thousand, six hundred ninety-six".